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require 'uri'
require "openid/extras"
module OpenID
module URINorm
public
def URINorm.urinorm(uri)
uri = URI.parse(uri)
raise URI::InvalidURIError.new('no scheme') unless uri.scheme
uri.scheme = uri.scheme.downcase
unless ['http','https'].member?(uri.scheme)
raise URI::InvalidURIError.new('Not an HTTP or HTTPS URI')
end
raise URI::InvalidURIError.new('no host') unless uri.host
uri.host = uri.host.downcase
uri.path = remove_dot_segments(uri.path)
uri.path = '/' if uri.path.length == 0
uri = uri.normalize.to_s
uri = uri.gsub(PERCENT_ESCAPE_RE) {
sub = $&[1..2].to_i(16).chr
reserved(sub) ? $&.upcase : sub
}
return uri
end
private
RESERVED_RE = /[A-Za-z0-9._~-]/
PERCENT_ESCAPE_RE = /%[0-9a-zA-Z]{2}/
def URINorm.reserved(chr)
not RESERVED_RE =~ chr
end
def URINorm.remove_dot_segments(path)
result_segments = []
while path.length > 0
if path.starts_with?('../')
path = path[3..-1]
elsif path.starts_with?('./')
path = path[2..-1]
elsif path.starts_with?('/./')
path = path[2..-1]
elsif path == '/.'
path = '/'
elsif path.starts_with?('/../')
path = path[3..-1]
result_segments.pop if result_segments.length > 0
elsif path == '/..'
path = '/'
result_segments.pop if result_segments.length > 0
elsif path == '..' or path == '.'
path = ''
else
i = 0
i = 1 if path[0].chr == '/'
i = path.index('/', i)
i = path.length if i.nil?
result_segments << path[0...i]
path = path[i..-1]
end
end
return result_segments.join('')
end
end
end
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